iClever 2.4G Wireless Numeric Keypad (Card Size) with Li-ion Battery Built In, Black Full-size 18-key Keypad: Compact wireless keypad consisted of 18 full-size and concave keys including backspace enables comfy input and improved productivity Plug and Play: Just insert the provided USB receiver into USB interface of your computer, no driver required. It allows cordless workspace and long working range up to 10m LED Indicator: The blue LED indicator on top left corner indicates whether its ready for data entry or not(Press Num Lock button to shift numbers and function inputting). Auto Sleep Mode: It enters into hibernation/sleep mode if no operation within 30 minutes, energy saving and frugal Compact and Rechargeable: Palm size and lightweight as 2.35oz, Micro USB rechargeable, this slim keypad takes little space on your desktop